Make the Fries

• Position racks in the center of your oven and preheat the oven to 425 degrees F. Coat a large, rimmed baking sheet with nonstick spray.
• Spread the sliced zucchini onto paper towels or a dry kitchen towel. Lightly pat dry. Let rest on the towels while you prepare the coating.
• In a wide, shallow dish (a pie dish works well) combine the Panko, flour, Parmesan, salt, onion powder, and pepper. In a separate bowl that is large enough to coat the zucchini, briskly whisk the egg whites until lightly foamy.
• Working five or six zucchini fries at a time, place the zucchini in the bowl with the egg whites, tossing to coat them evenly. Shake off any excess egg white, then add them to the bowl with the Panko. Coat them with the Panko, pressing it on lightly so that it adheres. Arrange the zucchini on the baking sheet.
• Lightly but thoroughly coat the exposed sides of the zucchini with the cooking spray. Bake for 10 minutes, then remove from the oven and lightly coat with baking spray once more. Return to the oven, rotating the pan 180 degrees, then continue baking for 10 additional minutes, until the crumbles are crisp and golden and the insides are tender.
• While the zucchini bakes, prepare the dipping sauce. In a small mixing bowl, whisk together all of the ingredients: the Greek yogurt, basil, garlic, Worcestershire, salt, and pepper. Taste and adjust the seasoning as desired. Serve the fries immediately, with the sauce for dipping.